GB1363778A - Capacitive matrix - Google Patents

Capacitive matrix

Info

Publication number
GB1363778A
GB1363778A GB4646672A GB4646672A GB1363778A GB 1363778 A GB1363778 A GB 1363778A GB 4646672 A GB4646672 A GB 4646672A GB 4646672 A GB4646672 A GB 4646672A GB 1363778 A GB1363778 A GB 1363778A
Authority
GB
United Kingdom
Prior art keywords
capacitance devices
matrix
amplifiers
capacitive matrix
heading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4646672A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1363778A publication Critical patent/GB1363778A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/04—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using capacitive elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
    • H03K17/98—Switches controlled by moving an element forming part of the switch using a capacitive movable element having a plurality of control members, e.g. keyboard

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Electronic Switches (AREA)
  • Amplifiers (AREA)

Abstract

1363778 Selective signalling INTERNATIONAL BUSINESS MACHINES CORP 9 Oct 1972 [30 Nov 1971] 46466/72 Heading G4H A matrix of variable-capacitance devices can have its columns driven in turn to produce current outputs to row amplifiers, each amplifier having a low impedance with respect to the capacitance devices. Current integrating amplifiers are used.
GB4646672A 1971-11-30 1972-10-09 Capacitive matrix Expired GB1363778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20339071A 1971-11-30 1971-11-30

Publications (1)

Publication Number Publication Date
GB1363778A true GB1363778A (en) 1974-08-14

Family

ID=22753791

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4646672A Expired GB1363778A (en) 1971-11-30 1972-10-09 Capacitive matrix

Country Status (4)

Country Link
JP (1) JPS5437457B2 (en)
DE (1) DE2247972A1 (en)
FR (1) FR2161969B1 (en)
GB (1) GB1363778A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168816A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Touch-sensitive position sensor apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5611144Y2 (en) * 1975-04-08 1981-03-13
JPH07109572B2 (en) * 1984-02-29 1995-11-22 東京プレス工業株式会社 Capacity keyboard
US4651133A (en) * 1984-12-24 1987-03-17 At&T Technologies, Inc. Method and apparatus for capacitive keyboard scanning
US5499208A (en) * 1994-09-12 1996-03-12 At&T Corp. Integrated circuit memory device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293640A (en) * 1964-05-22 1966-12-20 Chalfin Albert Electronic systems keyboard and switch matrix
US3437795A (en) * 1965-06-28 1969-04-08 Ampex Data input devices and systems
DE1549570A1 (en) * 1967-04-03 1971-03-04 Elektronische Rechenmasch Ind Circuit for a contactless keyboard, preferably for electronic calculating machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168816A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Touch-sensitive position sensor apparatus

Also Published As

Publication number Publication date
FR2161969A1 (en) 1973-07-13
JPS5437457B2 (en) 1979-11-15
FR2161969B1 (en) 1975-03-28
JPS4864838A (en) 1973-09-07
DE2247972A1 (en) 1973-06-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee